Android 自定义View-动态跳动线
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2022-03-28 12:58:44
import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.util.AttributeSet;import android.view.View;import java.lang.ref.WeakReference;/** * ================================================ * 作 .....
View的绘制基本由measure()、layout()、draw()这个三个函数完成
函数 | 作用 | 相关方法 |
---|---|---|
measure() | 测量View的宽高 | getMeasuredWidth(),getMeasuredHeight() |
layout() | 计算当前View以及子View的位置 | layout(),onLayout(),setFrame() |
draw() | 视图的绘制工作 | onDraw() |
效果图如下:
代码如下:
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import java.lang.ref.WeakReference;
public class LineView extends View {
private static final int mScaleMargin = 5; //刻度间距
LineThread lineThread;
private int start = 0;//起始值
private int beforeInit = 0;//前一个初始值
private int mWidth;//控件宽度
private int mHeight;//控件高度
public LineView(Context context) {
super(context);
}
public LineView(Context context, AttributeSet attrs) {
super(context, attrs);
lineThread = new LineThread(this);
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
int count = mWidth / mScaleMargin;//总刻度线,取控件一半宽度
int midLevel = mHeight / 2;//平均高度
// Log.i("LineView", "count: " + count + ",mid: " + midLevel);
//算法 1 2 3 4 3 2 1 2 3 4 3 2 1
for (int i = start; i < count + start; i++) {
if (i % 6 == 0) {//筛选出最小值
canvas.drawLine((i - start) * mScaleMargin, midLevel - 20, (i - start) * mScaleMargin, midLevel + 20, paint);
} else {
if (i % 3 == 0) {//筛选出最大值
canvas.drawLine((i - start) * mScaleMargin, midLevel - 80, (i - start) * mScaleMargin, midLevel + 80, paint);
} else {
if (i % 2 == 0) {//筛选出第二大值
canvas.drawLine((i - start) * mScaleMargin, midLevel - 40, (i - start) * mScaleMargin, midLevel + 40, paint);
} else {
canvas.drawLine((i - start) * mScaleMargin, midLevel - 30, (i - start) * mScaleMargin, midLevel + 30, paint);
}
}
}
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mWidth = getMeasuredWidth();
mHeight = getMeasuredHeight();
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
}
public void stopAnim() {
if (lineThread != null) {
lineThread.setRun(false);
lineThread.interrupt();
lineThread = null;
}
}
public void startAnim() {
lineThread = new LineThread(this);
lineThread.setRun(true);
lineThread.start();
}
public class LineThread extends Thread {
private WeakReference<LineView> threadWeakReference;
private boolean running = false;
LineThread(LineView lineView) {
this.threadWeakReference = new WeakReference<>(lineView);
}
private LineView getLieView() {
return threadWeakReference.get();
}
public void setRun(boolean isRun) {
this.running = isRun;
}
@Override
public void run() {
super.run();
while (running) {
try {
Thread.sleep(200);
//符合 0 1 2 3 2 1 0 算法
if (start == 0) {//峰谷
getLieView().beforeInit = start;
start++;
} else if (start == 3) {//峰顶
getLieView().beforeInit = start;
start--;
} else if (start == 1) {
if (getLieView().beforeInit > start) {
start--;
} else if (getLieView().beforeInit < start) {
start++;
}
} else if (start == 2) {
if (getLieView().beforeInit > start) {
start--;
} else if (getLieView().beforeInit < start) {
start++;
}
}
postInvalidate();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
本文地址:https://blog.csdn.net/xiaohelloming/article/details/107952877
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